<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #woqu{
            color: aqua;
        }
        .nihao{
            color: red;
        }
        div{
            color: blue;
        }
        div > p{
            color: coral;
        }
    </style>
</head>

<body>
    <div style="font-size: 2em;">Hello World!</div>
    <h1>一级标题</h1>
    <img src="https://tse1-mm.cn.bing.net/th/id/OIP-C.kS_7qmjEM2BvoKPLvm-l6AHaFj?w=193&h=180&c=7&r=0&o=5&dpr=1.3&pid=1.7">
    <p>ssss</p>
    <input type="password">

    <div id="woqu">woqu</div>
    <div class="nihao">hello</div>
    <div class="nihao">Lorem ipsum dolor s</div>
    <div>我是蓝色</div>
    <div>
        <p>
            黄色
        </p>
    </div>
</body>
</html>